We've used our Fly Creek 2 about a half a dozen times in the winter. We pull the sides up a bit with our trekking poles or a y- shaped branch propped under the guylines to get better ventilation to prevent condensation. We've never had more than a few inches of snow on it, but it survived that fine. I buried branches in packed snow to stake it out. I liked the fact I wasn't carrying my much, much heavier winter tent. Be cautious with the condensation. If your sleeping bag rubs against the side of the tent where condensation is forming it'll get wet. Check your condensation level after being in the tent awhile. If you're getting a lot forming on the underside of the fly, you need to get some ventilation going.
A little , you can live with and shake off in the morning.